84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
package environment
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import (
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"fmt"
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"io/ioutil"
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"os"
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"strings"
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jsoniter "github.com/json-iterator/go"
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)
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// ReadFile open file and replace the content $ENV.XXX
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func ReadFile(file string, defaults ...map[string]interface{}) ([]byte, error) {
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content := map[string]interface{}{}
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bytes, err := ioutil.ReadFile(file)
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if err != nil {
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return nil, err
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}
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err = jsoniter.Unmarshal(bytes, &content)
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if err != nil {
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return nil, err
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}
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defaultValues := map[string]interface{}{}
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if len(defaults) > 0 {
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defaultValues = defaults[0]
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}
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Replace(content, defaultValues)
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return jsoniter.Marshal(content)
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}
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// Replace replace content
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func Replace(content map[string]interface{}, defaults map[string]interface{}) {
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replaceMap(content, defaults)
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}
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func replaceAny(value interface{}, defaults map[string]interface{}) interface{} {
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switch value.(type) {
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case string:
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return replaceStr(value.(string), defaults)
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case map[string]interface{}:
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return replaceMap(value.(map[string]interface{}), defaults)
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case []interface{}:
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return replaceArr(value.([]interface{}), defaults)
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}
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return value
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}
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func replaceStr(value string, defaults map[string]interface{}) interface{} {
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if strings.HasPrefix(value, "\\$$ENV.") {
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return fmt.Sprintf("$ENV.%s", strings.TrimLeft(value, "\\$$ENV."))
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}
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if !strings.HasPrefix(value, "$ENV.") {
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return value
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}
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name := strings.TrimLeft(value, "$ENV.")
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v := os.Getenv(name)
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if v != "" {
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return v
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}
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return defaults[name]
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}
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func replaceMap(values map[string]interface{}, defaults map[string]interface{}) map[string]interface{} {
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for key, value := range values {
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values[key] = replaceAny(value, defaults)
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}
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return values
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}
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func replaceArr(values []interface{}, defaults map[string]interface{}) []interface{} {
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for key, value := range values {
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values[key] = replaceAny(value, defaults)
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}
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return values
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}
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